Dual Display Issues?

Hi there - I am a new mac owner and I have a problem that is stumping me. I want to connect two displays to the Dual 1 Gig Powermac G4 I bought. I didn't have the money to get new apple displays so I bought viewsonic VGA monitors instead. Now I can't figure out how to connect BOTH monitors to the machine. I am sure that I need an adapter but I have no clue which one!

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